Geothermal heat flux from hydrothermal plumes on the Juan de Fuca ridge


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dc.contributor.author Bemis, Karen G.
dc.coverage.spatial Juan de Fuca Ridge
dc.date.accessioned 2012-10-01T19:38:40Z
dc.date.available 2012-10-01T19:38:40Z
dc.date.issued 1990-05
dc.identifier.uri http://hdl.handle.net/1912/5410
dc.description Submitted in partial fulfillment of the requirements for the degree of Master of Science at the Massachusetts Institute of Technology and the Woods Hole Oceanographic Institution May 1990 en_US
dc.description.abstract Estimates of the heat output of hydrothermal vents, identified along the Endeavor and Southern Segments of the Juan de Fuca Ridge, are used to evaluate the total heat flux associated with hydrothermal circulation for the ridge segment. An array carried by D/V ALVIN sampled the temperature and velocity structure of hydrothermal plumes from individual vents . The maximum heat flux calculated for a single vent is 50 MW, but the average vent output is only 13 MW per vent for 31 vents. The estimates for any given vent may vary over an order of magnitude. This uncertainty is due mainly to the difficulty of locating the centerline of the plume relative to the point of measurement, although the uncertainty in determining the constants from the appropriate equations based on laboratory experiments contributes a significant share to the net error. For the Endeavor Segment, the minimum total geothermal heat flux due to hydrothermal circulation exceeds 70 MW. The minimum estimate for the Southern Segment is 16 MW. The maximum estimate is probably closer to the total heat flux (236 MW and 66 MW respectively) . The estimated heat flux density is 3300 W/m2 for the Endeavor vent field and 39 W/m2 for the Southern vent field. Focused hydrothermal venting accounts for only a small fraction of the heat available according to steady-state predictions of conductive heat flux; however, other hydrothermal phenomena (e.g., diffuse flow) account for the greater share of the total hydrothermal heat flux. en_US
dc.description.sponsorship This project was supported by NSF grant #OCE87-14511 and by the WHOI Education Office. en_US
dc.format.mimetype application/pdf
dc.language.iso en_US en_US
dc.publisher Massachusetts Institute of Technology and Woods Hole Oceanographic Institution en_US
dc.relation.ispartofseries WHOI Theses en_US
dc.subject Hydrothermal vents en_US
dc.title Geothermal heat flux from hydrothermal plumes on the Juan de Fuca ridge en_US
dc.type Thesis en_US
dc.identifier.doi 10.1575/1912/5410

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